field_helpers.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#ifndef OPENOCD_TARGET_RISCV_FIELD_HELPERS_H
#define OPENOCD_TARGET_RISCV_FIELD_HELPERS_H
 
#include <stdint.h>
#include <assert.h>
 
static inline uint64_t get_field(uint64_t reg, uint64_t mask)
{
    return (reg & mask) / (mask & ~(mask << 1));
}
 
static inline uint32_t get_field32(uint64_t reg, uint64_t mask)
{
    uint64_t value = get_field(reg, mask);
    assert(value <= UINT32_MAX);
    return value;
}
 
static inline uint64_t set_field(uint64_t reg, uint64_t mask, uint64_t val)
{
    /* Clear current value from field. */
    reg &= ~mask;
    uint64_t low_field_bit = mask & ~(mask << 1);
    /* Assert if the value doesn't fit in the field. */
    assert(((val * low_field_bit) & ~mask) == 0);
    reg |= (val * low_field_bit) & mask;
    return reg;
}
 
static inline uint32_t set_field32(uint32_t reg, uint32_t mask, uint32_t val)
{
    return (uint32_t)set_field(reg, mask, val);
}
 
static inline uint64_t field_value(uint64_t mask, uint64_t val)
{
    return set_field(0, mask, val);
}
 
static inline uint32_t field_value32(uint32_t mask, uint32_t val)
{
    return set_field32(0, mask, val);
}
 
#endif /* OPENOCD_TARGET_RISCV_FIELD_HELPERS_H */